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Derivatives (Tables)
12 Months Ended
Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Fair values of derivative financial instruments
The following table summarizes the fair values and the presentation of our derivative financial instruments (defined and discussed individually below) in the consolidated balance sheets:
 
 
 
December 31,
 
Balance Sheet Location
 
2019
 
2018
 
 
 
(In millions)
Derivative asset:
 
 
 
 
 
1.125% Call Option
Current assets: Derivative asset
 
$
29

 
$
476

Derivative liability:
 
 
 
 
 
1.125% Conversion Option
Current liabilities: Derivative liability
 
$
29

 
$
476